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Chapter 19 Quality of Service (QoS)
P-2812HNU-51c User’s Guide
326
Automatic Priority Queue Assignment
If you enable QoS on the P-2812HNU-51c, the P-2812HNU-51c can automatically
base on the IEEE 802.1p priority level, IP precedence and/or packet length to
assign priority to traffic which does not match a class.
The following table shows you the internal layer-2 and layer-3 QoS mapping on
the P-2812HNU-51c. On the P-2812HNU-51c, traffic assigned to higher priority
queues gets through faster while traffic in lower index queues is dropped if the
network is congested.
Table 110 Internal Layer2 and Layer3 QoS Mapping
PRIORITY
QUEUE
LAYER 2 LAYER 3
IEEE 802.1P
USER PRIORITY
(ETHERNET
PRIORITY)
TOS (IP
PRECEDENCE)
DSCP
IP PACKET
LENGTH (BYTE)
0 1 0 000000
12
2 0 0 000000 >1100
3 3 1 001110
001100
001010
001000
250~1100
4 4 2 010110
010100
010010
010000
5 5 3 011110
011100
011010
011000
<250
6 6 4 100110
100100
100010
100000
5 101110
101000
7 7 6 110000
111000
7